TransSiP PI Series - Part 2: ADI Silent Switcher LT8622S Becomes Noise-Free

In Part 1, we explored the intricate details of the LT8622S, focusing on the ripple voltage of the 2MHz fundamental switching frequency and its harmonics, along with the switching noise extending into microwave frequencies.

In this second part, we demonstrate the remarkable capabilities of TransSiP's Harmony PI Filter and Keysight Infiniium MXR B-Series oscilloscope. This filter not only eliminates the harmonics created by the fundamental switching frequency of the Silent Switcher but goes beyond that. It eradicates all high-frequency and microwave frequency spurious signals, making a noise-free switcher a reality.

The Harmony PI Filter significantly reduces the remaining amplitude of the fundamental switching frequency by almost 40dB, from about -59dBm to -97dBm, equivalent to about 8.9uVp-p. This single tone low frequency is significantly low in amplitude, ensuring it does not cause detrimental effects to the rest of the circuits, such as, VCXO, TCXO, LNA, PA, etc.

Join us as we delve deeper into the world of noise-free switchers, demonstrating the power and efficiency of the Harmony PI Filter. Stay tuned!